add NetworkCIDR for overlays

internal/pkg/overlay/datastructure.go

@@ -31,6 +31,7 @@ type TemplateStruct struct {
 	Ipaddr6        string
 	Netmask        string
 	Network        string
+	NetworkCIDR    string
 	Ipv6           bool
 	Dhcp           warewulfconf.DhcpConf
 	Nfs            warewulfconf.NfsConf

internal/pkg/overlay/overlay.go

@@ -289,6 +289,8 @@ func BuildOverlayIndir(nodeInfo node.NodeInfo, overlayNames []string, outputDir
 	tstruct.Ipaddr6 = controller.Ipaddr6
 	tstruct.Netmask = controller.Netmask
 	tstruct.Network = controller.Network
+	netaddrStruct := net.IPNet{IP: net.ParseIP(controller.Network), Mask: net.IPMask(net.ParseIP(controller.Netmask))}
+	tstruct.NetworkCIDR = netaddrStruct.String()
 	if controller.Ipaddr6 != "" {
 		tstruct.Ipv6 = true
 	} else {